Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 838 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
2. 2.🦾 A servo program runs:
   angle = 50
   angle = angle − 10
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 100
   angle = angle − 10
   angle = angle + 30
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and right (b) points left (c) points up and left (d) points right
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
6. 6.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
8. 8.🦾 A servo program runs:
   angle = 110
   angle = angle − 50
   angle = angle − 40
   angle = angle + 60
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
10. 10.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 50
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
16. 16.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
17. 17.🦾 A servo moves from 130° to 20°. How many degrees does it turn?
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
20. 20.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
21. 21.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points right (c) points straight up (d) points up and left
24. 24.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
25. 25.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
26. 26.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
27. 27.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 30° to 70°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
38. 38.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points right (b) points up and left (c) points up and right (d) points left
39. 39.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
40. 40.🦾 A servo moves from 140° to 50°. How many degrees does it turn?

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